Quote:
Originally Posted by switchlanez
215 is narrow relative to the size recommended by the OEM on their optional 7.5" wheels. 225 > 215. That's straight inequality math, not opinion.
Assume stock 17x7 +48 as baseline to compare flushness:
TRD 17x7.5 +43: (0.5"/2)*(25.4mm/inch) + 5mm = 6.35mm + 5mm = 11.35mm more flush than stock
TWS 18x8 +44: (1"/2)*(25.4mm/inch) + 4mm = 12.7 + 4mm = 16.7mm more flush than stock
TWS is 5.35mm more flush than TRD. That's more than a spacer. And millimeters count (I run a 3mm spacer for clearance).
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Can you show me where the OEM recommends 225's vs 215's on 7.5 rims? I doubt they would do that creating a speedo error. In fact, if you go to the Subaru site, they list 215's for all wheels including the performance package and tS which have 7.5 wheels. Look it up on their site.
Secondly, your calculation is in error. This is an example that mirrors the physics teachers you quoted before who lack real world experience and thus don't understand dynamic analysis. Wheels carry something called "tires". Tires stick out more than the wheels. Thus, it doesn't matter what wheel size you use because the poke will be based on the part of the tire/wheel that sticks out the most. You have a precise calculation but it does not mirror the real world. In fact, with the same width tire, the TRD rim will, in reality, be slightly more flush than your rim because of the offset. By the way, I see no reason not to put a 225 on either rim as it is well within the tire specs. That being said, if you put 215 on the 7.5" rim and a 225 on the 8" rim, then the section width difference is 0.4"/2*25.4 or 5mm. In that case, your 225 would be 4mm more flush. Because of the section width, however, if I do get the 7.5" rims, I'll probably also go for the 225's because they are a slightly better fit. And thus, I'll be a little more flush than you.
And again, I think your wheels look great!!!! I liked them so much I did a search to see the price. I wouldn't have done that otherwise. If they would have been in the price range of the TRD wheel, I might well have been convinced. However, they cost twice as much and that is hard to justify given that they would both be almost just as flush....